When it comes to describing a lack of knowledge, "ignorant of" is a commonly used phrase. However, there exist numerous synonyms that can help add variety and depth to your expression. Instead of saying "ignorant of", one could use the following alternatives: "unaware of", "uninformed about", "clueless regarding", "unacquainted with", "unfamiliar with", "naïve to", "blind to", "having no knowledge of", "without comprehension of", "in the dark about", "unschooled in", "oblivious to" or "out of touch with". Embracing these synonyms can enrich your writing and enhance your ability to convey the idea of lacking knowledge or being uninformed.